Improved ventilator



P. LEAR.

Ventilator. No; 45,672. PatentdDee. 27. 1864.

Witnesses: Invento'r: i hurl,-

I] M wrny 1/6554 I y/ m,

UNITED STATES.

PATENT OFFICE.

PETER LEAR; OF MEDFORD, ASSIG'NOR TO HIMSELF, AND 'S'AML. A. BRAD- "BURY, OF DORGHESTER, MASSACHUSETTS.

' JMPROVEDVENTILATCR.

Specification forming part of Letters ,To all whom it may concern:

Be it known that 1, PETER LEAR, of Med ford,.in,the county of Middlesex and State of Massachusetts,have invented a new and useful '01- Improved Ventilator'-f0r Chimneys or Air- Flues and I do herebydeclare the same to.be fully described in the following specification and represented in the accompanying draw: ings, of which---- i v Figure 1 denotes a front elevation, and Fig. 2, a vertical section, of it. Fig. 3 is a hori-' zontal section taken through its impelling buckets or floats. Fig. 4 is a horizontal section taken through its centrifugal and radial wings.

In the said drawings, A denotes a hollow windwheel closed at its upper end, 0, and mounted concentrically with a vertical spindie, 13, whose lowerend rests in a stop, a, and

whose upper end is supported in a bearing, b,

- sustainedby an arched or bent bar, C, erected over the mouth I) or upper end of a smokechi'mney or air-flue, Es Between the lower.

- cross-section and is to be arranged with respect to each of the buckets next adjacent to it in manneras represented in'Fig. 3. Furthermore, there is an air-passage, f, leading through. the head d, and into the space between each two of the wings, F F F F. It is through this air-passage that the surplus airof Patent No. 45,672, dated December 27, 1864.

the wind-wheel is drawn by the action of the wings while the ventilator maybe in revolution.

or smoke from the chimney or flue, the series of win gs should be placed above the mouth D; but when it may be desirable to force air into and down the flue or chimney, these wings should be disposed directly below the said month and withint-he chimney or fine.

When a current of air may be blowing against the buckets or; floats of the said windwh-eel, it will generallyset such wheel and the series of wings in rapid revolution.- This rotary movement of 'the series of wings will cause the air in the sectoral spaces immediately between them to be discharged centrifugally, a likeainonnt of air at the same time passing through the month D to supply the place of the discharged air. In thisway a draft muybe'created' in the flue or chim y, the surplus air blown intothe wheel bei ig discharged therefrom by the fans or wings.

Under this construction the wheel will be J found to operate to betteradvanta'ge than were it unprovided with the openings or passages leading from it into the spaces between the wings.-

a means of creating a draft in a smoke fine or an aerial current through a ventilatingpipe or air-duct, my improved ventilator has been found to be highly serviceable.

I claim- V The said improved ventilator, constructed substantially in manner and 'so as to operate as described.

- PETER LEAR. Witnesses:

It. H. EDDY, F. P. HALE, ,J r.

When it may be desirable to discharge air 

